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Shift of the resonant wavelength plotted as a function of refractive index shift (Δn). Linear fit of the experimental data yields Δλ/Δn ≈ 532 nm/RIU (sensitivity) for a dynamic range of 4 × 10−4 RIU (R2 = 0.84). For a dynamic range of 2.1 × 10−4 RIU, the linear fit of the experimental data yields a sensitivity of Δλ/Δn ≈ 836 nm/RIU (R2 = 0.97). The error bars refer to fluctuations on the resonant wavelength after successive injections with the same fluid.
